Release 1.1.7 changes.md update (#4184)
Release 1.1.7 changes.md update (#4184)

* Release 1.1.7 changes.md update

* Mention last 2 PRs merged

hzysoft/RxJava,weikipeng/RxJava,tilal6991/RxJava,nurkiewicz/RxJava,davidmoten/RxJava,nurkiewicz/RxJava,hzysoft/RxJava,davidmoten/RxJava,weikipeng/RxJava,weikipeng/RxJava,nurkiewicz/RxJava,tilal6991/RxJava,hzysoft/RxJava,davidmoten/RxJava,tilal6991/RxJava